s advance, s3 mini
i don't think s duos selling in malaysia, so get ace duos
else, get csl mi501 (good spec than both of them)

S Advance will be having a look similar to the s2, while the mini will be exactly like the s3 juz tht its smaller and specs are lower... both screens are 4 inch.. Primary cameras are both 5mp... Mini's secondary camera will be VGA while S Advance will be 1.3MP....Video will be at 720p for both phones. Ppi will be 233 per inch for both phones... S3 mini will be lighter 8grams then the s advance.... It all comes to personal prefence since the specs are almost identical..... The s3 Mini will be newer since it has juz launch in Malaysia officially.... If u like squarish phones... the S Advance will be the way to go.... If u like the s3 but dont like the big screen of it.... go for the s3 mini...
Hope this helps